Whether you’ve worked all night, partied too late, jumped on a red-eye, or just couldn’t turn off your thoughts, one thing’s for sure: The next day will be hellish. Thankfully, sleep experts have your step-by-step game plan for powering through the following day with some degree of productivity and alertness. “It’s a scenario we encounter a lot,” says Dr. Mark Boulos, a neurologist at Toronto’s Sunnybrook Health Sciences Centre, who knows how to have one — but probably not two — productive days without sleep. Here’s what to do.